1020 results about "Hydraulic machinery" patented technology

An electronic transmission control system is provided that can achieve a transmission ratio based on the operator inputs and the current vehicle operating conditions. The transmission constantly connects the engine to the load, and the transmission ratio is only varied by a change in command from the present invention. The transmission's mechanical function is solely to vary the ratio between its input and output. In using the present invention, an operator must select an operating mode, either automatic or manual, using a two-position switch. While in the automatic mode, the present invention determines the vehicle speed by considering the position of the throttle and the operator's use of brakes. In the manual mode, the present invention further considers the operator's selection of a gear condition.

A vibration damper with a hydraulic-mechanical pressure stop includes a cylinder filled with damping medium; a piston rod movable in and out of the cylinder, a first piston fixed to the piston rod with freedom of axial movement, a second piston spaced from the first piston, a transfer spring in the second working space for moving the second piston toward the third working space in response to movement of the first piston toward the second working space; and a disk valve which allows damping medium to flow from the third working space through the second piston to the second working space as the second piston moves toward the third working space. The first piston divides the cylinder into a first and a second working space where the piston rod extends through the first working space. The second piston separates the second working space from a third working space.

A vehicle control system which is capable of performing a quick decelerating operation in all vehicle speed regions and setting a direct region where power from an engine is transmitted through a mechanical transmission unit only in a hydro-mechanical transmission. The vehicle control system includes an engine and a hydro-mechanical transmission and is designed to set a tractive force-vehicle speed characteristic corresponding to the direct region where power transmission from the input shaft to the intermediate output shaft of the hydro-mechanical transmission is done by the mechanical transmission unit alone in a specified engine speed region. An engine control system controls the engine and a decelerator outputs a deceleration command according to an operating amount thereof. The engine control system controls the engine to reduce engine output torque corresponding to a specified engine speed region in response to the deceleration command.

The present invention relates to a hydraulic drive system for driving an apparatus, with a drive unit, a first and a second hydraulic displacement machine, with which the drive unit is connectable or connected for transmitting mechanical energy, and a third and a fourth hydraulic displacement machine, which are connectable o r connected with the apparatus for transmitting mechanical energy, wherein the first hydraulic displacement machine is hydraulically connected or connectable wit h the third hydraulic displacement machine, and wherein a high-pressure accumulator is provided, which is hydraulically connected or connectable with the second and the fourth hydraulic displacement machine.

This invention consists of two or more fixed displacement hydraulic pump / motors mounted on a common input shaft hydraulically connected to two or more fixed hydraulic pump / motors mounted on a common output shaft. The relative displacements of the pump / motors are chosen such that by selectively activating the individual pump / motors, the transmission ratio can be changed in the case when the input devices and acting as pumps driving the output devices as motors (conversely when driving the vehicle in reverse). Further, a hydraulic accumulator and reservoir are attached in a manner that allows the pressurized fluid to augment the flow produce by the input pumps in order to increase the transmission ratio. Similarly, the transmission ratio can also be reduced by causing the input pumps to pump fluid into the accumulator at the same time they are pumping fluid through the output motors. The transmission also contains a single speed all mechanical by-pass for use when cruising and an input reduction gear to increase the torque and power capacity of the transmission.A further feature of the transmission is a valve arrangement that allows the transmission to generate a continuously variable braking torque when the transmission is used to supply braking force to the vehicle.In addition, the transmission includes a selectable, one-way clutch that connects the input directly to the output. When engaged, this clutch provides an all mechanical by-pass to the hydraulic transmission for use when cruising in order to improve the efficiency.